Air filters are widely used in various places such as homes, offices, hospitals, schools, factories, etc. In homes and offices, air filters can effectively remove harmful substances such as particles and bacteria from indoor air, ensuring people's respiratory health; In hospitals and schools, air filters can reduce the risk of virus and bacterial transmission, providing a safe and healthy environment for teachers, students, and patients; In factories, air filters can remove harmful gases and odors, ensuring the physical health and production safety of workers.